| Budget Amount *help |
¥18,460,000 (Direct Cost: ¥14,200,000、Indirect Cost: ¥4,260,000)
Fiscal Year 2018: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2017: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2016: ¥9,230,000 (Direct Cost: ¥7,100,000、Indirect Cost: ¥2,130,000)
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| Outline of Final Research Achievements |
The purpose of this study was to develop man-made beachrocks cemented by precipitated CaCO3, which were produced by using natural coastal materials. This technique endowed the man-made beachrocks with an unconfined compressive strength (UCS) of approximately 20-30 MPa after approximately one month of curing. The technique was newly developed in this study and validated for its effectiveness.
A search for ureolytic bacteria that yield high urease activity was conducted in coastal areas in Japan. Several types of discovered bacteria that exhibited suitable properties for precipitating CaCO3 were isolated from soil samples in areas such as Okinawa prefecture and Hokkaido. Accelerated laboratory solidification tests on sand samples were performed using the bacteria. The results demonstrated that after three weeks, the samples yielded approximately 20 MPa of UCS as measured in needle penetration tests. In conclusion, the effectiveness of the newly developed technique was validated.
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